Paravallaridine compounds and derivatives and process of making same



J. LE MEN 3,161,636

COMPOUNDS AND DERIVATIVES AND PROCESS OF MAKING SAME 9 Sheets-Sheet 1 lNVfNTOR Jean is Men Mm AGENT Dec. 15, 1964 PARAVALLARIDINE Filed Jan. 28, 1963 Dec. 15, 1964 LE MEN 3,161,636

J. PARAVALLARIDINE COMPOUNDS AND DERIVATIVES AND PROCESS OF MAKING SAME Filed Jan. 28, 1963 9 Sheets-Sheet 2 l 240m J AZ 300 m, 250 y 200 m INVENTOR fad/7 Le Men BY MUM AGENT Dec. 15,1964 J. LE MEN 3,161,636

PARAVALLARIDINE COMPOUNDS AND DERIVATIVES AND PROCESS OF MAKING SAME Filed Jan. 28, 1963 9 Sheets-Sheet 3 900 70a lllll IIJAIII 1400 I200 1500 I 1300 l 1100 1000 .1

INVENTOR Jean Le Men BY Ma mW/WM,

AGENT Dec. 15, 1964 LE EN ,161,636

J. M PARAVALLARIDINE COMPOUNDS AND DERIVATIVES AND PROCESS OF MAKING SAME Filed Jan. 28, 1963 9 Sheets-Sheet 4 o 3 v; Q 3 3r I E 2 m. N l E E U o:

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PARAVALLARIDINE COMPOUNDS AND DERIVATIVES AND PROCESS OF MAKING SAME Filed Jan. 28, 1963 9 Sheets-Sheet 5 kW M.

Q & Q .Q g Q Q m m m w w m 8 3 E 8 3 $0 8 AGENT Dec. 15, 1964 J. LE MEN PARAVAE \ARIDINE COMPOUNDS AND DERIVATIVES AND PROCESS OF MAKING SAME '9 Sheets-Sheet 6 Filed Jan. 23, 1963 SK 8% Q8 w mt H mm N wk. Wn

BY WM AGENT Dec. 15, 1964 J. LE MEN PARAVALLARIDINE COMPOUNDS AND DERIVATIVES AND PROCESS OF MAKING SAME 9 Sheets-Sheet '7 Filed Jan. 28, 1965 Q; on 00 mm 3 am am INVENTOR Jean [2 Men BY WAWl/LW AGENT Dec. 15, @1964 J. LE MEN 3,151,535

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Q I Q; to a 0 Q E Q Q Q a INVENTOR Jdfl Le Men BY M WWW AGENT 9 Sheets-Sheet 9 J. LE MEN AND PROCESS OF MAKING SAME Dec. 15, 1964 PARAVALLARIDINE COMPOUNDS AND DERIVATIVES Filed Jan. 28, 1963 mam QQQ United States Patent 3,161,636 PARAVALLAINE COMPOUNDS AND DERIVA- TlVlES AND PROCESS OF MAKING SAME Jean Le Men, Lirneil-Brevannes, Seine-et-Oise, France,

assignor to Roger Bellon, Neuilly-sur-Seine, Seine, France Filed Jan. 28, 1963, Ser. No. 254,336 Claims priority, application Great Britain, Jan. 30, 1962, 3,46'7/62 11 Claims. (Cl. 260-23957) This invention relates to paravallaridine compounds and derivatives and a process of making same.

Paravallarine and paravallaridine, which are two alkaloids extracted from Paravallaris microphylla Pitard and are obtained, for instance, as described in the Bulletin de la Societe Chimique de France, 1960, page 860 (paravallarine) and in applicants copending application Serial No. 170,569, filed February 2, 1962, now US. Patent No. 3,137,691, and entitled Method for Extraction of Paravallaridine and Derivatives Thereof.

The present invention provides a process for the prepa- 3,161,636 Patented Dec. 1 5, 1 964 B represents the oxo group or the secondary alcohol group,

which process comprises reacting paravallaridine or a derivative thereof with a chlorinating agent to form the N-chlorinated derivative of paravallaridine in a first reaction step, and removing the chloramiue formed in a second reaction ,step, thereby producing the oxo group.

Thus, the N-chlorinated derivative of paravallaridine is prepared in a first step and the chloramine which is formed is removed in a' second step, for example by means of a solution of an alkali metal alcoholate in an anhydrous alcohol.

In the first step of the process it is possible to use N-chlorosuccinimide or hypochlorous acid as the chlorinating agent, the reaction taking place in the cold in an anhydrous organic solvent such as an ether or a chlorinated solvent. The excess of chlorinating agent is then removed, for instance, by washing with water, the solvent is driven off at aternperature below 40 C., the chloramine which has formed is destroyed in the second step.

Throughout this specification, the nomenclature (208) has the same meaning as given by Cahn, Ingold and Prelog in Experientia, 1956, vol. 12, p. 81, and subsequently by Karnber, Cainelli, Anigoni and Jeger in Helv. Chim. Acta, 1960, vol. 43, p. 347.

The compounds of the above given Formula III are novel compounds which have interesting pharmaceutical properties. They have a vaso-dilatory action on the blood vessels, a sedative action'on the central nervous system and a distinct anti-ulcer effect The following examples illustrate the invention:

EXAMPLE 1 3-0x0-A -Deamii'zoparavallaridiize 20s)soxo-i6a,20-DInYDRoXY-1s-oro LACTONE(+20)- PREGNA--ENE A solution of paravallaridine (1 g.) in 15 cc. of methylene chloride and a solution of N-chlorosuccinimide (1 g.) in 15 cc. of the same solvent were mixed and stirred together at room temperature for two hours.

ration of paravallaridine derivatives of the Formula 111:,

Z (111) wherein X represents the 0x0 group, the secondary alcohol group,

or di-lower alkoxy;

Y and Z represent hydrogen or, when X is oxo or di-lower alkoxy, a second bond between the carbon atoms in 4- and 5-positions;

A represents methylene or carbonyl;

R represents hydrogen;

R represents hydroxyl or, when A iscarbonyl, together i with R adirect oxygen to carbon bond between the oxygen atom attached to the carbon atom 18 and the carbon atom in 20-position, thereby forming a fivemembered lactone ring; and V v The reaction solution was washed 4 times with cc.

' of water, dried over dry sodium sulfate and distilled in vacuo at a temperature below 40 C. The white residue (1.3 g.) was further dnied for 1 hour at 20 C. in vacuo at a pressure of 0.01 mm. Hg, then heated under reflux with 50 cc. of an ethanolic solution of sodium ethanolate,

prepared with 300 mg. of sodium metal.

I on 25 g. of alumina.

The reaction solution, which was golden-yellow in color, was then poured into 200 cc. of a 1% aqueous solution of sulfuric acid and the whole was extracted three times with 150 cc. of chloroform. The combined chloroform solutions were successively washed with 100 cc. of a 5% aqueous solution of sodium bicarbonate and twice'with 100 cc. of water, then distilled to dryness. In this way, 325 mg. of compound A were recovered.

The acid aqueous-alcoholic solution which had been extracted with chloroform was freedfrorn alcohol by distillation, make alkaline by the addition of ammonia and than again extracted with chloroform. In this way, there were obtained, after distilling off the solvent, 390 mg. of compound B having an infra-red spectrum which can be superimposed on that of compound A.

The fractions A and B were immediately combined, dissolved in chloroform and subjected to chromatography 7 By elution with a chloroformethanol mixture (99: 1), there were recovered 630 mg. of a slightly yellowish colored compound which, on recrystallization from acetone, yielded a first bath of 140. mg. of

3,161,636 3 4 C=O lactone band at 5.7a, a C=C a,fi-unsaturated ketone EXAMPLE 4 band at 6.05,u and a C=C band at 62 The ultrawiolet Spectrum, Shown in F1 G. 2 of the 35,304 Dzmethoxy De Ammo Dzhydroparavallarldme (20S)-3fl,3a DIMETHOXY-16a,20-DIHYDROXY-18-OIC accompanying drawings, has a A max. 240 111p, log 6=4.18.

Analysis for C H O .-Calculated, percent: (1:73.22; 5 LACTONE( 20)'5PREGNANE H=8.19;O=18.58. Found, percent: C=73.36; H=8.39; 0 0 H1 0:18.81. o c n CH3 EXAMPLE 2 3-Ox0-Deamin0-Dihydr0paravallaridine (20S)3-OXO16a,20-DIHYDROXY-18-OIC LACTONE 20) H300 5a-PREGNANE moo Using a technique similar to that of Example 1, 1 g. of H dihydroparavallaridine yielded 590 mg. of a crude saturated ketone which, by simple recrystallization from meth- To the solution of 150 mg. of (S)-3-oxo-16u,20-dianol, gave a first batch of 370 mg. of 3-oxo-deaminodihydroxy-18-oic lactone( 20)-5apregnane in 3 cc. of hydroparavallaridine. Melting point: 252 C.; the infra- 20 anhydrous methanol, there were added 5 mg. of parared spectrum, shown in FIG. 3 of the accompanying drawtoluenesulfonic acid and the mixture was heated to 100 ings, has an OH-band at 2.92 a C=O lactone band at C. for 5 minutes. After cooling, the reaction solution 5.7 1., a C=O non-conjugated ketone band at 5.95 was made alkaline by the addition of sodium metha- (a) =0i2 (concentration= 0.25% in chloroform). nolate, then diluted with 200 cc. of water and extracted Analysis for C H O .Calculated, percent: C=72.80; 25 three times with 200 cc. of ether. The combined ethereal H=8.73; 0:18.47. Found, percent: C=72.61, 72.78; solutions were washed with water, dried and then evapo- H=8.66, 8.78; 0:18.12, 18.03. rated to dryness to yield a'residue weighing 149 mg. g The desired dimethoxylated derivative was obtained EXAMPLE 3 therefrom by recrystallization from methanol. Melting point: 184 C.; (a) =ll (concentration=0.82% in chloroform).

Analysis for C H O .Calculated, percent: C=70.37; (20S)-3B,16a,20-TRIHYDROXY 1S-OIC LACTONE(+20)- Found, Percent! (3:70-19;

SwPREGNANE The infra-red spectrum of this compound is shown in FIG. 5 of the accompanying drawings.

30 2,8-Hydr0xy-Deamin0-Dihydroparavallaridine [Reduction of 3-oxo-deamino dihydroparavallaridine by means of potassium boron hydride] EXAMPLE 5 250 mg. of 3-oxo-deamino-dihydroparavallaridine were. dissolved in 20 cc. of methanol and stirred for 2 hours 3,16-Di0x0 Deamino Dihydroparavallarine with 1 g. of potassium boron hydride. 20s 3,16-DIOXO-20-HYDROXY-18-OIC LACTONE( 20)- The solution was diluted wlth 75 cc. of water and 5a PREGNANE extracted with chloroform. The decanted chloroform solution was washed with water, dried and then distilled to leave 220 mg. of a residue, which, on recrystallization a from acetone, yielded 140 mg. of 3 8-hydroxy-deamino- CH3 n dihydroparavallaridine. Melting point: 235 C.;

(a) ='12.9 (concentration=0.27% in chloroform).

Analysis for C H O .Ca1culated, percent: C=72.62;

H=8.93. Found, percent: 0:72.33; H=9.13.

The infra-red spectrum of this compound is shown in FIG. 4 of the accompanying drawings.

In the following examples, the keto group was tem- 5 porarily blocked in the 3-position of the deamino-3-oxodihydroparavallaridine of Example 2 by conversion into the diketal form (Example 4) in order to permit selective opening of the lactone ring by reduction by means of lithium aluminum hydride (Example 6).

The same result can be obtained by temporarily blocking the keto group of Example 2 by conversion into the A mixture of a solution of 300 mg. of ((20S)-3-oxo- 16a,20-dihydroxy-18-oic lactone( 20)-5a-pregnane) in 10 cc. of acetic acid and of a solution of 450 mg. of chromic acid anhydride in 25 cc. of water was heated on a boiling water bath for 5 minutes'and then stirred dloxolane form I at room temperature for 2 hours. After diluting the reaction mixture by adding it to 200 cc. of water and CHFO making it alkaline by the addition of sodium carbonate,

0 the precipitate was extracted with 500 cc. of chloro- OH 0 form. The decanted chloroform solution was washed with water anddried over anhydrous sodium sulfate and, after distilling off the solvent, a residue of 220 mg. was C f l chromic acid Oxidation f the compound obtained which yielded the desired diketone when recording to Example 2 yielded the diketone of Example 5. crystallized from acetofle- Melting *P The tetrol of Example 7 was also obtained by reduction, ()D='- -26% in hloroform).

the compound of Example 6 with potassium boron hy- Analysis for C H O .Calculated, percent: C=73.22; dride KBH or the lactone diol of Example 2 with lithium H=8.19; 0:18.59. Found, percent: C=73.05; H=8.07; aluminum hydride. 0:18.49.

The tetrol of Example 8 was obtamed by reduction of The infra-red spectrum of this compound is shown in the diketone of Example 5 with-LiA1H FIG. 6 of the accompanying drawings.

5 EXAMPLE 6 3-Ox0 Deamino Dihydroparavallaridinol (20S)-3-OXO-lGa,18,20-TRIHYDROXY-5a-PREGNANE OH OH CH CH3 Hg C--H To a solution of 245 mg. of '(20S)-3a,3B-dimethoXy- 16a,20-dihydro-18-oic lactone( 20)-5a-pregnane (or 3,6, 3ix-dimethoXy-deamino-dihydroparavallaridine) in 5 cc. of tetrahydrofuran and 20 cc. of ether, there were added 200 mg. of lithium aluminum hydride, and the mixture was refluxed for 5 hours. After destroying the excess of said reducing agent by the. addition of 100 cc. of moist ether and 5 cc. of methanol, there were added 5 cc. of a saturated aqueous solution of sodium sulfate and then '20 g. of anhydrous sodium sulfate. The organic liquid phase was decanted, washed with water, then dried and finally evaporated to dryness to yield a residue weighing 206 mg. This residue was then heated under reflux for minutes with 10 cc. of a methanolic solution containing 2% of sulfuric acid. The resulting solution was diluted with 200 cc. of water and extracted with '250 cc. of ether; the ethereal phase was washed with water, dried and then evaporated to dryness to yield a residue of200 mg. The desired compound was obtained therefrom by recrystallization from acetone. Melting point; 198 (2.; (a) =+24 (concentration:0.73% in chloroform).

Analysis for C H O .Calculated, percent: 0:71.96; H:9.78. Found,percent: C:72.08; H:9.90.

The infra-red spectrum of this compound is given in FIG. 7 of the accompanying drawings.

EXAMPleE-7 (S) 65,] 6a,18,20-Tetrahydroxy-5a-Pregnane 7 OH OI-I/CH: CH3 'om O-- H A solution of 100 mg. of (20S) -3-oxo-16a,1-8,20-trihydroxy-5u-pregnane in 20 cc. of methanol was stirred at room temperature for three hours with 500 mg. of potassium boron hydride. The reaction solution was diluted in 200 cc. of water and extracted twice with 250 cc. of chloroform. The decanted chloroform solutions were combined, washed with water, dried, and then finally evaporated to dryness. The resulting residue, after heating with stirring under reflux with 10 cc. of boiling benzene and filtering While hot, yielded 82 mg. of the desired tetrol on filtering. Melting point: 245 C. (decomposition from 235 C. on); (a) :+7 (concentrati0n':0.-51% in methanol) Analysis for C H O .-Calculated, percent C:71.55; 11:10.30. Found, percent: 0:71.48; H:10.12.

The same compound could be obtained by reduction of (20S) 3 3 hydroxy 16,2O dihydroxy 18-oic lactone( 20)-5a-pregnane by means of lithium aluminum hydride in a mixture of tetrahydrofuran (1 part) and ether (5 parts).

The infra-red spectrum of this compound is shown in FIG. 8 of the accompanying drawings.

EXAMPLE 8 (208) 3,8,165,18,ZO-TeZrahydrOxy-Sa-PregImne o H OH CH CH3 H2 100 mg. of (20S)-3,16-dioXo-20-hydroxy 18 oic lact-one( 20)-5u-pregnane (or 3,16-dioxodeaminoparavall-aridine) were dissolved in 1 cc. of tetrahydrofuran and 100 cc. of ether and reduced by means of 300 mg. of lithium aluminum hydride by boiling the reaction mixture for five hours. After destroying the excess of lithium aluminum hydride by the addition of 50cc. of moist ether and 1 cc. of methanol, there were added 100 cc. of normal hydrochloric acid solution and then 500 cc. of chloroform. The organic layer was decanted, washed with water, dried and distilled. There was thus obtained a dry residue which was washed with 50 cc. of boiling benzene and then recrystallized from methanol to yield mg. of the desired tetrol. Melting point: 258 C.; (e) :-]-43 (concentration:0.5 5 in methanol) Analysis for C l-1 0 Calculated, percent: 0:71.55; H:10.30. vFound, percent: C:7l.69; H: 10.43

on. R; on. I 1 on. x

NWB

wherein V X represents a member selected from the group consisting of oxo, the secondary alcohol group, and lower dialk-oxy; A represents a member selected from the group consisting of methylene and carbonyl; R represents hydrogen; R represents a member selected from the group consisting of hydroxyl and, when A is carbonyl, forming together with R and oxygen to carbon bond to complete a five-membered lactone ring; B represents a member selected from the group consisting of hydroxyl and oxo; and Y and Z are members selected from the group consisting of hydrogen and, when X is oxo and di-lower alkoxy, a second carbon to carbon bond between the carbon atoms in 4- and S-positions. 2. (208) 3 oxo 1611,20 dihydroxy 18-oic lactone 20)-pregna-4-ene.

3. (208) 3 oxo 1611,20 dihydroxy-18-oic lactone 20)-5a-pregnane.

4. (20S)-3,8,16a-20-trihydroxy-1 8-oic lactone 20)- Sa-pregnane.

5. (20S)-3;3,3u-dirnethoXy-16a,20-dihydroxy 18 oic lactone 20) -5a-pregnane.

6. (20S)-3,16-dioXo-20-hydroxy-18-oic lactone 20 a-pregnane.

7. (208 -3 -oxo-l6a,18,20-trihydroxy-Sa-pregnane.

8. (20S)65,160,18,2O-tetrahydroxy-5a-pregnane.

9. (20S)-3,8,165,18,20-tetrahydroXy-5a-pregnane.

10. In a process of producing a paravallaridine derivative of the formula:

wherein X represents a member selected from the group consisting of oxo, the secondary alcohol group, and lower dialkoxy;

A represents a member selected from the group consisting of methylene and carbonyl;

R represents hydrogen;

R represents a member selected from the group consisting of hydroxyl and together with R when A is carbonyl, forming an oxygen to carbon bond to complete a five-membered lactone ring;

B represents a member selected from the group consisting of hydroxyl and oxo, and

Y and Z are members selected from the group consisting of hydrogen and, when X is oxo and di-lower alkoxy, a second carbon to carbon bond between the carbon atoms in 4- and 5-positions;

the steps which comprise chlorinating a paravallaridine compound of the formula wherein Y and Z are members selected from the group consisting of hydrogen and a second carbon to carbon bond between the carbon atoms in 5- and 6-positions, with a chlorinating agent, selected from the group consisting of N-chloro succinimide and hypochlorous acid to form the corresopnding N-chlorinated derivative and reacting said derivative with a solution of an alkali metal alcoholate in an anhydrous alcohol to convert the chloro methylamino group into the 0x0 group.

11. In a process of producing a paravallaridine derivative of the formula:

OR! R2 CH5 l l 0H A r wherein X represents a member selected from the group consisting of oxo, the secondary alcohol group, and lower dialkoxy;

A represents a member selected from the group consisting of methylene and carbonyl;

R represents hydrogen;

R represents a member selected from the groupvconsisting of hydroxyl and, when A is carbonyl, together with R forming an oxygen to carbon bond to complete a five-membered lactone ring;

B represents a member selected from the group consisting of hydroxyl and 0x0, and

Y and Z are members selected from the group consisting of hydrogen and, when X is oxo and di-lower alkoxy, a second carbon to carbon bond between the carbon atoms in 4- and-S-positions,

the steps which comprise chlorinating a paravallaridine compound of the formula CH3 (1) (IX wherein Y and Z are members selected from the group consisting of hydrogen and a secondcarbon to carbon bond between the carbon'atoms in 5- and 6-positions, with a chlorinating agent, selected from the group consisting of N-chloro succinimide and hypochlorous acid at room temperature in an anhydrous organic solvent, to form the corresponding N-chlorinated derivative, removing the excess chlorinating agent by washing with water, distilling off the organic solvent at a temperature below 40 C., and reacting said N-chlorinated derivative with a solution of an alkali metal alcoholate in an anhydrous alcohol to convert the chlo'ro methylamino group into the 0x0 group.

No referencescite'd. 

1. THE PARAVALLARIDINE DERIVATIVE OF THE FORMULA 